JP5587400B2 - Crimping process monitoring method, crimping press and computer program product - Google Patents

Description

  The present application claims priority based on US Provisional Patent Application No. 61 / 168,212 April 9, 2009 and the corresponding US patent application, and priority based on Swiss Patent Application No. 0580/09 dated April 9, 2009. It is an application with a claim for rights. With this reference, the entire contents of these US Provisional Patent Application No. 61 / 168,212 and Swiss Patent Application No. 0580/09 are expressly incorporated herein in the context of all intents and purposes and are described herein. It is assumed that it is.

  In the present invention, whether or not the actual value of the force gradually changing along the stroke axis or the time axis during crimping is within an allowable band having an upper boundary above the ideal value of the force and a lower boundary below. The present invention relates to a method for monitoring a crimping process, including a step of determining whether or not at least one point and a step of determining that the crimping bonding is acceptable when it is determined that it is within the range. The present invention further provides that the actual value of the force gradually changing along the stroke axis or the time axis during crimping is within an allowable band having an upper boundary above the ideal value of the force and a lower boundary below. A crimping press that can be used to perform the method according to the present invention, comprising: a means for determining whether or not there is at least one point; and a means for determining that the crimping bonding is acceptable when it is determined that the bonding is in place. . The present invention also relates to a computer program product that is loaded into the memory of a crimping press control device and functionally implements the method according to the present invention.

  Crimping is a special beading technique that joins parts, for example, wires and (plug-like) connectors, by plastic deformation. Since electrical and mechanically stable permanent bonding can be obtained and it is suitable as an alternative to other types of connection methods such as welding and soldering, crimping is a field of electrical equipment such as communication equipment and automotive electrical equipment. It is often used in. However, if the shape of the crimping point is not strictly aligned with that of the wire, the amount of deformation of the wire cannot be made the required amount. The crimping is usually performed with a crimping gripper or a crimping press.

  As is known in the art, measuring the force acting during the crimping process is useful for monitoring and stabilizing the quality of the crimp joint formed by the crimping press. In the example shown in FIG. 5, this can be implemented by providing pressure sensors between the frame dies 14, between the drive plungers 15, or both. It is also useful for examining the deformation of the frame constituting the crimping press.

  For example, in the crimping process quality monitoring method described in Patent Document 1, a peak coefficient, that is, a crimping work divided by a force peak value is obtained in order to obtain a required quality, and an average value and a standard deviation over a large number of learning samples are obtained. Based on the boundary setting.

  Next, in the crimping process monitoring method described in Patent Document 2, a force that gradually changes along the stroke axis during crimping is measured and compared with a reference value that gradually changes along the stroke axis. Evaluation is based on a specific threshold.

  Furthermore, in the crimping process monitoring method described in Patent Document 3, the force gradually changing along the time axis during crimping is measured, the crimping work is calculated, the measured force is divided into a plurality of segments, and the actual value of the crimping work is calculated. Is compared with the reference value for each segment.

  Further, in the crimping process monitoring method described in Patent Document 4, a force that gradually changes along the stroke axis during crimping is measured, and it is determined whether or not it falls within a reference range. Furthermore, based on statistical theory, a continuous band indicating an allowable variation in gradually changing force is set.

  In the crimping process monitoring method described in Patent Document 5, a force gradually changing along the stroke axis during crimping is measured, and a group of data element pairs is selected from the measurement results in the region of interest. Furthermore, the current crimping operation quality is determined by analyzing these data element pairs and comparing them with a group of standard data element pairs collected in a known high quality crimping operation.

  In addition, in the crimping electrical connection evaluation method described in Patent Document 6, the crimping force is measured over the range of impact position variation in the crimping apparatus, and the statistical allowable range of the force is obtained. The force is measured for each crimping, and the result of the measurement is checked against the statistical tolerance to determine whether or not the crimping bonding is successful. Passed crimp joints are re-evaluated to determine if the data should be added to the database.

US Pat. No. 5,841,675 (A) US Pat. No. 6,418,769 (B1) European Patent Application No. 1243932 (A2) US Pat. No. 5,937,505 (A) European Patent No. 0460441 (B1) European Patent Application No. 0730326 (A2)

  However, these methods are still improved in that the determination as to whether the crimp joint is good (pass) or bad (fail) is ambiguous, ie, in a form that allows some crimp variation. There is room left.

  It is an object of the present invention to improve the crimping process monitoring method, the crimping press and the computer program product so that human intervention during crimping can be reduced.

In order to achieve this object, the crimping process monitoring method according to the present invention, in addition to the steps described in the technical field,
Determining at least one point whether the actual value of the force gradually changing along the stroke axis or the time axis during crimping is above or below the ideal value of the force; and
If it is determined that it is above the upper boundary, if it is determined that it is below, it is below, and the upper boundary is below the upper boundary so that the upper boundary does not exceed the absolute upper limit and the lower boundary does not fall below the absolute lower limit. Shifting the side boundary or both;
Have

Furthermore, the pressure bonding press for forming the pressure bonding according to the present invention is in addition to various means described in the technical field,
Means for discriminating at least one point whether the actual value of the force gradually changing along the stroke axis or the time axis during the crimping is above or below the ideal value of the force;
If it is determined that it is above the upper boundary, if it is determined that it is below, it is below, and the upper boundary is below the upper boundary so that the upper boundary does not exceed the absolute upper limit and the lower boundary does not fall below the absolute lower limit. Means for shifting the side boundary or both;
Is provided.

  In addition, the computer program product according to the present invention is a product that realizes the functions according to the method of the present invention when loaded into the memory of the crimping press control device.

  When these characteristic techniques are applied, the tolerance band for the determination of the pass / fail judgment is adapted to the change in conditions. The condition change is a slight condition variation (variation in material thickness, material characteristics, etc.) of the wire or the crimping destination, temperature change, drift of the force sensor or stroke sensor, and the like. In the prior art, such changes had to be monitored by the operator directly or indirectly through the effect on the crimp joint and appropriate action had to be taken. This entails significant (continuous) adjustments that can be cumbersome, for example, a crimping press operator may have to deal with morning temperature increases every day. According to the present invention, the press can be adapted to a change in conditions by self-control by each crimping press. For example, if the situation where the actual value of the gradually changing force along the stroke axis or the time axis exceeds the ideal value of the force in the same tendency is continuously generated in several crimping operations, the upper boundary, the lower boundary, or Both are shifted up. In this case, even if the actual value of the force gradually changing along the stroke axis or the time axis is above the upper boundary before the shift, if it is below the upper boundary after the shift, the crimp joint is still determined to be acceptable. It will be. Thus, the need for human intervention can be greatly suppressed.

  In the present invention, the upper boundary shift above the absolute upper limit and the lower boundary below the absolute lower limit are also prohibited. In this way, setting the absolute upper and lower limits that limit the shift of the upper and lower boundaries of the tolerance band is also useful for the operator as well as the tolerance band dynamically moving and expanding / contracting. Otherwise, when a malicious result is continuously obtained by several crimping operations, the tolerance band moves and expands and contracts as in Patent Document 6, and the ideal crimping (along the stroke axis or time axis). It may be far from the ideal value of the gradually changing force. Under such circumstances, the type of crimp joint that was determined to be unacceptable at the beginning of application of the adaptive algorithm is erroneously determined to be acceptable at some point after the tolerance band movement / expansion / contraction. In the present invention, there is no case where the deviation from the ideal crimping progresses without warning and the erroneous determination becomes apparent.

  In the present invention, the determination regarding the gradually changing force can be executed at one point or at a plurality of points. It is desirable to obtain an overview by making a distinction at points dispersed throughout the gradual range. However, in terms of suppressing the required information processing ability, it is desirable to execute the determination only when a certain threshold value is exceeded, and to focus on the actual crimping occurrence region.

  In the present invention, the ideal value of the gradually changing force can be initially derived through a so-called educational process. For example, the actual value of the gradually changing force is stored by several crimping operations, and the operator of the crimping press determines the stored actual value, and the height, width, electrical characteristics, appearance, scratch pattern, etc. What is necessary is just to derive | lead-out an ideal value according to the preserve | saved actual value about the crimping | joining joining seen from the above etc. that is good quality. For the process of deriving the ideal value, the least squares method or the like can be used.

  In the present invention, means for determining whether or not the actual value of force gradually changing along the stroke axis or time axis during crimping is within the allowable band, means for determining pass / fail of crimping, stroke axis or Means to determine if the actual value of the force that gradually changes along the time axis is above or below the ideal value of the force, and the former shifts the upper boundary, the lower boundary, or both, and the latter shifts downward Including the means for causing the crimping press components to be realized in software, hardware or a combination thereof. Furthermore, these components can be part of a control device for a crimping press (separate). If these means are implemented in software, an appropriate programming language can be selected arbitrarily, and appropriate software functions, software routines, etc. can be created using it, and the code can be stored in the memory of the crimping press controller. It is desirable to do. As is obvious, the code is individually loaded into the central processing unit for the crimping press during control.

  There are several preferred embodiments of the present invention as described in the dependent claims, the description of the embodiments and the accompanying drawings.

One preferred embodiment is
Arrange the first region above the ideal value of the gradually changing force, the second region below,
Shifting the upper boundary, the lower boundary, or both, upward when the actual value of the gradually changing force is within the first region, and downward when it is within the second region,
It is a form.

  In this embodiment, since a plurality of regions are used to control the shift of the tolerance band, specifically, the upper and lower boundaries thereof, it is possible to suitably realize the adaptation of the crimping process.

  As a preferable aspect of the present embodiment, there is an aspect in which a gap is provided between the ideal value of the gradually changing force and each of the first and second regions. This is a slow response algorithm. This is because the tolerance band is not moved or scaled by sporadic deviation from the ideal crimping. This is the introduction of a kind of hysteresis.

  As a preferable aspect of the present embodiment, there is also an aspect in which the ideal value of the gradually changing force and each of the first and second regions are adjacent to each other. This is a fast response algorithm. Since the actual value hardly overlaps with the ideal value, in this mode, the tolerance band is moved and expanded / reduced almost without exception at each crimping.

  As a preferable aspect of the present embodiment, there is also an aspect in which a gap is provided between the upper boundary and the first region and between the lower boundary and the second region. This is a slow response algorithm because the tolerance band adaptation process is not triggered when the actual value of the gradual force along the stroke axis or time axis deviates significantly from the ideal value.

  As a preferable aspect of this embodiment, there is also an aspect in which the upper boundary and the first region are adjacent to each other and the lower boundary and the second region are adjacent to each other. When the actual value of the force gradually changing along the stroke axis or the time axis deviates greatly from the ideal value, the tolerance band adaptation process is activated, so this is a fast response type algorithm.

Other preferred embodiments of the present invention include:
The first region of the ideal value of the gradually changing force is the first region, the second region is the lower region, the third region is the upper region, the fourth region is the lower region,
When the actual value of the gradually changing force is within the first region, the lower boundary is upward, when it is within the second region, the upper boundary is downward, and when it is within the third region, the upper boundary is upward , If it falls within the fourth region, shift the lower boundary downward,
There is a form.

  According to the knowledge of the inventor, such a configuration makes it possible to smooth the shift of the upper and lower boundaries, that is, to prevent an excessively high or low speed shift. This makes it possible to continue to obtain the required crimping quality over a long period of time or over various disturbance conditions.

  As a preferable aspect of the present embodiment, the ideal value of the gradually changing force and the first and second regions, the first region and the third region, and the second region and the fourth region are adjacent to each other. There is a mode to make it. This is a fast response type algorithm because tolerance band movement and expansion / contraction occur in many crimping operations.

  As a preferred aspect of the present embodiment, the ideal value of the gradually changing force is adjacent to each of the first and second regions, while between the first region and the third region and between the second region and the fourth region. There is also an aspect in which a gap is provided between the two. This is a low-speed response type algorithm because tolerance band movement and expansion / contraction do not occur in many crimping operations. Therefore, this algorithm can be suitably employed in a crimping press.

  As a preferable aspect of the present embodiment, there is also an aspect in which a gap is provided between the upper boundary and the third region and between the lower boundary and the fourth region. This is a slow response algorithm because the tolerance band adaptation process is not invoked when the actual value of the gradual force along the stroke axis or time axis deviates significantly from the ideal value. Therefore, this algorithm can also be suitably employed in a pressure press.

  In the present embodiment, it is convenient that the probability that the actual value of the gradually changing force falls within the region is substantially the same between the first to fourth regions. If so, the upper and lower boundaries can be converged within a range of three times the standard deviation σ by executing a sufficient amount of processing according to the present invention, for example, 1000 times.

  A preferred embodiment of the present invention further uses a physical variable derived from the force instead of or in addition to the force. An alternative to or in addition to force that can be the basis of the present invention is, for example, crimping work. The first derivative of force can also be the basis.

  As a preferred embodiment of the present invention, after repeating the process according to the present invention a predetermined number of times, the average value of the tolerance band is set to the ideal value of the force that gradually changes. In this embodiment, not only the permissible band but also the ideal value of the gradually changing force, that is, the standard that is recognized as ideal crimping is changed. Therefore, it is possible to more appropriately cope with the influence of the change in conditions on the crimping process.

  It should be noted that the above-described processing forms, modifications, and effects according to the present invention also apply to the crimping press and the computer program product according to the present invention.

  The embodiments described herein can be combined in any desired manner.

It is a figure which shows the relationship between the ideal value and actual value of the force which changes gradually along a stroke axis, and an allowance zone. It is a figure which shows what the ideal value and tolerance zone of the force which changes gradually after repeating the process which concerns on this invention several times. It is a figure which shows embodiment which controls tolerance zone movement and expansion / contraction using two area | regions. It is a figure which shows the example which provides a clearance gap between 2 area | regions in FIG. 3a, and the ideal value of the force which changes gradually. It is a figure which shows the example which provides a clearance gap between 2 area | regions in FIG. 3a, and an upper and lower boundary. It is a figure which shows the example which provides a clearance gap between the 2 area | region in FIG. 3a, the ideal value of the force which changes gradually, and an upper and lower boundary. It is a figure which shows embodiment which controls tolerance zone movement and expansion / contraction using four area | regions. It is a figure which shows the whole crimping | compression-bonding press with the die | dye 14 and the plunger 15. FIG.

  Hereinafter, the present invention will be described with reference to the accompanying drawings in order to facilitate understanding of the present invention. The broad technical scope of the present invention should not be construed as being limited by the accompanying drawings and the following description.

  In the following description and the appended claims, unless otherwise specified, the term “gradually changing force” includes both a gradually changing force along the stroke axis and a gradually changing force along the time axis. Used in meaning.

  FIG. 1 shows a force-to-stroke ideal relationship curve or ideal pressure-bonding curve indicating the ideal value Fi of the force gradually changing along the stroke axis, and a force-to-stroke actual relationship curve or actual pressure-bonding curve (dashed line) indicating the actual value Fa of the force. , And the upper boundary Bu and the lower boundary Bl of the tolerance band are schematically shown. In this example, when the actual value Fa is within the allowable band, it is determined that the crimp bonding is acceptable. As shown in the figure, in this example, the actual value Fa is lower than the ideal value Fi in the first part, is higher in the second part, and is lower again in the third part. The arrows indicate the directions in which the boundaries Bu and Bl of the tolerance band are shifted frequently.

  For the sake of simplicity, only an example of force gradually changing along the stroke axis is shown, but the matters described in this application are easy to understand for those skilled in the art (so-called persons skilled in the art). Can be similarly applied to force gradually changing along the time axis.

  FIG. 2 shows how the ideal value Fi of the force gradually changing as shown in FIG. 1 and the allowable band after the process according to the present invention is repeated several times. As shown in the drawing, some depressions appear from the deviation from the ideal crimp in the tolerance band. Similarly, as shown in the figure, the allowable band width is not uniform and widens with time. In this example, the process according to the present invention is executed only when the force exceeds a certain threshold value Ft. In other words, the determination is made by focusing on the attention area that is the actual crimping occurrence area. Furthermore, the processing according to the present invention is executed at a plurality of points in the figure.

  Of course, instead of these points, the processing according to the present invention may be executed in several areas or ranges.

  3a to 3d and FIG. 4 show details of the force gradually changing along the stroke axis as shown in FIGS. 1 and 2, particularly the point, region or range where the processing according to the present invention is executed.

  First, in the example shown in FIG. 3A, the shifts of the boundaries Bu and Bl are controlled using the regions Z1 and Z2. That is, if the actual value Fa of the gradually changing force is within the first region Z1, the upper boundary Bu, the lower boundary Bl, or both are shifted upward. If the actual value Fa is within the second region Z2, the upper boundary Bu, the lower boundary Bl, or both are shifted downward. As illustrated, the first region Z1 is adjacent to the ideal value Fi and the upper boundary Bu of the gradually changing force, and the second region Z2 is adjacent to the ideal value Fi and the lower boundary Bl. Furthermore, an absolute upper limit Lu for limiting further upward shift of the upper boundary Bu and an absolute lower limit L1 for limiting further downward shift of the lower boundary Bl are also illustrated. Since the upper boundary Bu, the lower boundary Bl, or both are shifted each time the crimp joint is determined to be acceptable, including when the crimp joint is not totally ideal, the response of this algorithm is relatively fast. Become.

  The example shown in FIG. 3b is very similar to the example shown in FIG. 3a. The only difference is that there is a gap between the ideal value Fi of the gradually changing force and each of the regions Z1 and Z2. When the pressure bonding is almost ideal (when the actual value is close to the ideal value Fi and is between the regions Z1 and Z2), the upper boundary Bu and the lower boundary Bl are not shifted, so the response of this algorithm is slightly slow.

  The example shown in FIG. 3c is similar to the example shown in FIG. 3a. In this example, gaps are provided between the first region Z1 and the upper boundary Bu, and between the second region Z2 and the lower boundary Bl. If the actual value is far from the ideal value, it is accepted and the upper boundary Bu and the lower boundary Bl are not shifted, so the response of this algorithm is also slightly slower.

  The last example shown in FIG. 3d also uses the regions Z1 and Z2 in a form similar to the example shown in FIG. 3a. In this example, gaps are provided between the first region Z1 and the ideal value Fi and the upper boundary Bu of the gradually changing force, and between the second region Z2 and the ideal value Fi and the lower boundary Bl. Yes. The response of this algorithm is slightly slower and its stability is slightly higher.

  FIG. 4 shows still another embodiment. When viewed from the ideal value Fi of the gradually changing force, there is a first region Z1 in the upper side, a second region Z2 in the lower side, a third region Z3 in the upper side, and a fourth region Z4 in the lower side. . If the actual value Fa of the gradually changing force is within the first region Z1, the lower boundary Bl is shifted upward. If the actual value Fa is within the second region Z2, the upper boundary Bu is shifted downward. If the actual value Fa is within the third region Z3, the upper boundary Bu is shifted upward, and if it is within the fourth region Z4, it is shifted downward. In particular, since the smooth movement / expansion / reduction is possible, the present embodiment can be suitably applied to a pressure press.

  Further, in the present embodiment, there is a first region Z1 next to the ideal value Fi of the gradually changing force, and a third region Z3 with a gap above the first region Z1, and next to the ideal value Fi. There is a fourth region Z4 with a gap between the second region Z2 and the second region Z2. A gap may be provided between the upper boundary Bu and the third region Z3, or between the lower boundary Bl and the fourth region Z4. This embodiment is more suitable for the crimping process.

  As a specific example of the present embodiment, the force value range gradually changing along the stroke axis is divided into 1024 segments, and it is determined for each segment whether or not the actual value of the force is within the regions Z1 to Z4. There are aspects. In this aspect, the crimping process can be monitored and controlled very accurately.

  If the probability that the actual value of the gradually changing force falls within the region is substantially the same between the regions Z1 to Z4, the boundaries Bu and Bl can be converged within a range three times the standard deviation σ. That is, 99.73% of the pressure bonding is determined to be acceptable.

  Roughly speaking, the limit value of the lower boundary Bl is determined by the area ratio between the regions Z1 and Z4, and the limit value of the upper boundary Bu is determined by the area ratio between the regions Z2 and Z3. As can be easily understood by those skilled in the art, it is not necessary to make the distance to the ideal value Fi of the gradually changing force equal between the boundaries Bu and Bl, so that the area ratio between the regions Z1 to Z4 is set variously. Therefore, it is desirable to individually define the boundaries Bu and Bl. Further, the limit value of the boundaries Bu and B1 is determined by the area ratio between the areas Z1 to Z4, whereas the convergence speed is determined by the area of the areas Z1 to Z4. The wider the regions Z1 to Z4, the faster the response of this algorithm because the probability that the crimp joint will fit within the regions Z1 to Z4 increases. It is desirable that the widths of the regions Z3 and Z4 on the outer side be 1/18 of the distance between the ideal value Fi of the gradually changing force and the boundaries Bu and Bl.

  It should be noted that even if the areas Z1 to Z4 are equal in size, the probability that the actual value of the gradually changing force will fit in the areas Z1 to Z4 is not necessarily equal between the areas. Rather, there are more distributions with a high level of probability of being in the regions Z1 and Z2, such as a Gaussian distribution with a high level at the center. In such a distribution, unless the regions Z1 and Z2 are narrower than the regions Z3 and Z4, the probability of being in the regions Z1 to Z4 cannot be made equal between the regions. For example, in the case of permitting a Gaussian distribution or the like, it is necessary to do so in order to make the probability of being in the regions Z1 to Z4 equal between the regions.

  As a specific example of the crimping press according to the present embodiment, there is a mode in which the operator sets the crimping pass rate or the reject rate as he likes. In this aspect, the crimping press controller calculates the area ratio between the areas Z1 to Z4 based on the set pass rate or reject rate, and further, the area (absolute value) of the areas Z1 to Z4 based on the required convergence speed. ). In most cases, the crimping pass rate is set to 99.73% (three times the standard deviation σ), and 1 of the distance between the ideal values of the force gradually changing the widths of the regions Z3 and Z4 and the boundaries Bu and Bl. Setting it to / 18 gives satisfactory results.

  As can be easily understood by those skilled in the art, the illustrated and described processing can also be applied to physical variables derived from the force F, such as first-order differentiation of the force and crimping work.

  As a further preferred embodiment of the present invention, there is a form in which, after the process according to the present invention is repeated a predetermined number of times, the average value of the tolerance band is set to the ideal value Fi of the force that gradually changes. The number of iterations is preferably 50, for example. If it does in this way, field Z1-Z4 will be adaptively updated with respect to the new ideal value which affects the algorithm concerning the present invention. The absolute upper limit Lu and the absolute lower limit Ll may be similarly changed or may be kept constant. However, if the change is made in the same manner, the limit value changes in accordance with the change in the absolute upper limit Lu and the absolute lower limit L1, and as a result, the absolute upper limit Lu and the absolute lower limit Ll may drift away. Therefore, in many cases, it is better to fix the absolute upper limit Lu and the absolute lower limit Ll.

  The above description does not limit the technical scope of the present invention, and a person skilled in the art can make various configuration changes within the technical scope of the present invention defined in the appended claims. Please keep in mind. The invention described in a claim should not be construed as being limited by the fact that a reference sign is inserted in parentheses in the claim. The word “comprising” and similar verbs are not intended to generally exclude forms that include elements or steps not listed in any claim or in the description. There may be a single member or a plurality of members that do not have one or more explicit items. Some of the means described in the device type claims can be realized by the same software or hardware components. The fact that they are described in separate claims does not mean that a combination of these technical means cannot provide a useful effect.

  B1 Lower boundary, Bu upper boundary, F force, Fa Actual value of gradual force, Fi Ideal value of gradual force, Ft force threshold, Ll absolute lower limit, Lu absolute upper limit, s stroke, Z1-Z4 First to fourth regions, 14 dies, 15 plungers.

Claims (24)

The actual value (Fa) of the force that gradually changes along the stroke axis or the time axis during crimping has an upper boundary (Bu) above the ideal value (Fi) of the force and a lower boundary (Bl) below. Determining at least one point whether it is within the tolerance band; and
A step of determining that the crimp bonding is acceptable when it is determined that
A crimping process monitoring method comprising:
Determining at least one point whether the actual value (Fa) of the force gradually changing along the stroke axis or time axis during crimping is above or below the ideal value (Fi) of the force;
If it is determined that the upper boundary (Bu) exceeds the absolute upper limit (Lu), and the lower boundary (Bl) is determined in advance. Shifting the upper boundary (Bu), the lower boundary (Bl), or both so as not to fall below a definable absolute lower limit (Ll);
I have a,
The first region (Z1) is near the upper side of the ideal value (Fi) of the gradually changing force, the second region (Z2) is near the lower side, the third region (Z3) is on the upper side, and the fourth region is on the lower side. Arranging the region (Z4), and
When the actual value (Fa) of the gradually changing force is within the first region (Z1), the lower boundary (Bl) is upward, and when the actual value (Fa) is within the second region (Z2), the upper boundary (Bu) is Downward, shifts the upper boundary (Bu) upward when it falls within the third region (Z3), and shifts the lower boundary (Bl) downward when it falls within the fourth region (Z4).
Crimping process monitoring method characterized by the above. The crimping process monitoring method according to claim 1,
The first region (Z1) is disposed above the ideal value (Fi) of the gradually changing force, the second region (Z2) is disposed below, and the actual value (Fa) of the gradually changing force is the first region (Z1). ), The upper boundary (Bu), the lower boundary (Bl), or both are shifted to the upper side when they are within the second region (Z2), or the lower boundary (Bl), or both. Method. It is the crimping | compression-bonding process monitoring method of Claim 1 or 2 , Comprising: While the ideal value (Fi) of the force which changes gradually and between 1st area | region (Z1) and each of 2nd area | region (Z2) are adjacent, 1st area | region There is a gap between (Z1) and the third region (Z3) and between the second region (Z2) and the fourth region (Z4). It is the crimping | compression-bonding process monitoring method as described in any one of Claims 1 thru | or 3, Comprising: Between upper side boundary (Bu) and 3rd area | region (Z3), and between lower side boundary (Bl) and 4th area | region (Z4). There is a gap in the crimping process monitoring method. The crimping process monitoring method according to any one of claims 1 to 4 , wherein a physical variable derived from the force (F) is used instead of or in addition to the force (F). Method. The crimping process monitoring method according to any one of claims 1 to 5 , wherein after passing through a predetermined number of times, an average value of the tolerance band is set to an ideal value (Fi) of a gradually changing force. Crimping process monitoring method. The actual value (Fa) of the force that gradually changes along the stroke axis or the time axis during crimping has an upper boundary (Bu) above the ideal value (Fi) of the force and a lower boundary (Bl) below. Means for determining at least one point whether or not it is within the tolerance band;
Means for determining that the crimp bonding is acceptable when it is determined that
A crimping press for forming a crimped joint comprising:
Means for discriminating at least one point whether the actual value (Fa) of the force gradually changing along the stroke axis or the time axis during crimping is above or below the ideal value (Fi) of the force;
If it is determined that the upper boundary (Bu) exceeds the absolute upper limit (Lu), and the lower boundary (Bl) is determined in advance. Means for shifting the upper boundary (Bu), the lower boundary (Bl) or both so as not to fall below a definable absolute lower limit (Ll);
In addition,
The first region (Z1) is near the upper side of the ideal value (Fi) of the gradually changing force, the second region (Z2) is near the lower side, the third region (Z3) is on the upper side, and the fourth region is on the lower side. Area (Z4) is arranged,
When the actual value (Fa) of the gradually changing force is within the first region (Z1), the lower boundary (Bl) is upward, and when the actual value (Fa) is within the second region (Z2), the upper boundary (Bu) is Lower, means for shifting the upper boundary (Bu) upward when it falls within the third region (Z3), and shifting the lower boundary (Bl) downward when falling within the fourth region (Z4);
Crimping press according to claim Rukoto equipped with. A computer program product that is loaded into a memory of a control device for a press and that realizes a function related to a press-bonding process monitoring method according to any one of claims 1 to 6 . Obtaining an ideal value of the crimping force that gradually changes;
Determining a tolerance band to include an ideal value for the actual value of the crimping force that gradually changes;
Determining the upper boundary of the actual value for the tolerance band to be greater than or equal to the ideal value;
Determining a first region of actual values to be greater than or equal to an ideal value;
Making the lower edge of the first region the first lower edge of the actual value;
Setting the first lower edge of the actual value to exceed the ideal value;
Making the upper edge of the first region the first upper edge of the actual value;
Setting the first upper edge of the actual value to be greater than or equal to the first lower edge;
Setting a fixed upper limit of the actual value to be above the upper boundary;
Determining the lower boundary of the actual value for the tolerance band to be below the ideal value;
Determining a second region of actual values to be less than or equal to the ideal value;
Making the upper edge of the second region the second upper edge of the actual value;
Setting the second upper edge of the actual value to be less than the ideal value;
Setting the lower edge of the second region as the second lower edge of the actual value;
Setting the second lower edge of the actual value below the second upper edge;
Determining a fixed lower limit of the actual value to be below the lower boundary;
Measuring the actual value of the crimping force that gradually changes;
Determining whether the measurement result of the actual value is in the first region or the second region;
Dynamically shifting the tolerance band defined by the upper and lower boundaries according to the discrimination results;
Limiting the dynamic shift within a range defined by a fixed upper limit and a fixed lower limit;
Determining whether or not the measurement result of the actual value is within the tolerance band, and notifying that the crimp bonding is acceptable according to the determination result that is within the tolerance band; and
A crimping process monitoring method comprising: The crimping process monitoring method according to claim 9, further comprising a step of shifting the upper boundary of the permissible band upward in response to discrimination from the first region. The crimping process monitoring method according to claim 9, further comprising a step of shifting the lower boundary of the permissible band upward in response to discrimination from the first region. The crimping process monitoring method according to claim 9, further comprising a step of shifting the upper boundary of the permissible band downward in response to discrimination from the second region. The crimping process monitoring method according to claim 9, further comprising a step of shifting the lower boundary of the permissible band downward in response to discrimination from the second region. The crimping process monitoring method according to claim 9 ,
Determining the upper boundary of the tolerance band to coincide with the first upper edge of the first region;
Defining the lower boundary of the tolerance band to coincide with the second lower edge of the second region;
A crimping process monitoring method comprising: The crimping process monitoring method according to claim 9 ,
Determining the upper boundary of the tolerance band to exceed the first upper edge of the first region;
Defining the lower boundary of the tolerance band to be below the second lower edge of the second region;
A crimping process monitoring method comprising: 10. The crimping process monitoring method according to claim 9, further comprising the step of making the above determination only when the measurement result of the actual value exceeds the threshold value. Obtaining an ideal value of the crimping force that gradually changes;
Determining a tolerance band to include an ideal value for the actual value of the crimping force that gradually changes;
Determining the upper boundary of the actual value for the tolerance band to be greater than or equal to the ideal value;
Determining a first region of actual values to be greater than or equal to an ideal value;
Making the lower edge of the first region the first lower edge of the actual value;
Making the upper edge of the first region the first upper edge of the actual value;
Determining the first lower edge of the actual value to exceed the ideal value;
Setting the first upper edge of the actual value to be greater than or equal to the first lower edge;
Determining a third region of actual values to be greater than or equal to the first region and less than or equal to the upper boundary;
Making the lower edge of the third region the third lower edge of the actual value;
Setting the upper edge of the third region as the third upper edge of the actual value;
Setting a fixed upper limit of the actual value to be above the upper boundary;
Determining the lower boundary of the actual value for the tolerance band to be below the ideal value;
Determining a second region of actual values to be below the ideal value;
Making the upper edge of the second region the second upper edge of the actual value;
Setting the lower edge of the second region as the second lower edge of the actual value;
Determining the second upper edge of the actual value to be less than the ideal value;
Setting the second lower edge of the actual value below the second upper edge;
Defining a fourth region of actual values to be below the second region and above the lower boundary;
Making the upper edge of the fourth region the fourth upper edge of the actual value;
Making the lower edge of the fourth region the fourth lower edge of the actual value;
Determining a fixed lower limit of the actual value to be below the lower boundary;
Measuring the actual value of the crimping force that gradually changes;
Determining whether the measurement result of the actual value is within the first region, the second region, the third region, or the fourth region;
Dynamically shifting the tolerance band defined by the upper and lower boundaries according to the discrimination results;
Limiting the dynamic shift within a range defined by a fixed upper limit and a fixed lower limit;
Determining whether or not the measurement result of the actual value is within the tolerance band, and notifying that the crimp bonding is acceptable according to the determination result that is within the tolerance band; and
A crimping process monitoring method comprising: The crimping process monitoring method according to claim 17, further comprising a step of shifting the upper boundary of the permissible band downward in response to discrimination from the second region. 18. The crimping process monitoring method according to claim 17, further comprising a step of shifting the upper boundary of the permissible band upward in response to discrimination from the third region. The crimping process monitoring method according to claim 17, further comprising a step of shifting the lower boundary of the permissible band upward in response to discrimination from the first region. The crimping process monitoring method according to claim 17, further comprising a step of shifting the lower boundary of the permissible band downward in response to discrimination from the fourth region. The crimping process monitoring method according to claim 17 ,
Determining the upper boundary of the tolerance band to exceed the third upper edge of the third region;
Defining the lower boundary of the tolerance band to be lower than the fourth upper edge according to the fourth region;
A crimping process monitoring method comprising: The crimping process monitoring method according to claim 17 ,
Determining the upper boundary of the tolerance band to coincide with the third upper edge of the third region;
Defining the lower boundary of the tolerance band to coincide with the fourth lower edge according to the fourth region;
A crimping process monitoring method comprising: The crimping process monitoring method according to claim 17, wherein the difference between the third lower edge and the third upper edge is 1/18 times as large as the difference between the ideal value and the upper and lower boundaries of the tolerance band. A crimping process monitoring method comprising a step of determining a level difference.

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